Research Article
Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol
Table 6
The coefficients of the Langmuir, Freundlich, and Redlich-Peterson isotherms for phenol system.
| (a) |
| | CNTs | Langmuir isotherm | | (mmol/kg) | (L/mmol) | (−) | |
| | CNT-A (as synthesized) | 52.50 | 6.738 | 0.2227 | 0.8332 | | CNT-E (as synthesized) | 120.38 | 25.04 | 0.0774 | 0.7489 | | CNT-A-AM | 24.78 | 7.585 | 0.1936 | 0.7550 | | CNT-E-AM | 58.60 | 2.99 | 0.3850 | 0.8156 | | CNT-A-HM | 53.00 | 24.08 | 0.0745 | 0.6623 | | CNT-E-HM | 181.09 | 12.87 | 0.1434 | 0.9757 |
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| (b) |
| | CNTs | Freundlich isotherm | | (mmol/kg)/(mmol/L)1/n | | | |
| | CNT-A (as synthesized) | 57.31 | 2.0892 | 0.4787 | 0.8366 | | CNT-E (as synthesized) | 145.56 | 3.7348 | 0.2675 | 0.9975 | | CNT-A-AM | 25.85 | 2.6307 | 0.3801 | 0.5057 | | CNT-E-AM | 52.34 | 1.8019 | 0.5549 | 0.8513 | | CNT-A-HM | 57.86 | 4.9281 | 0.2029 | 0.5469 | | CNT-E-HM | 216.38 | 2.7947 | 0.3578 | 0.9892 |
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| (c) |
| | CNTs | Redlich-Peterson | | (L/g) | (L/mmol) | (mmol/kg) | (−) | |
| | CNT-A (as synthesized) | 0.51 | 46.45 | 10.9510 | 0.60 | 0.8956 | | CNT-E (as synthesized) | 4.97 | 61.12 | 81.2698 | 0.90 | 0.9959 | | CNT-A-AM | 0.18 | 7.67 | 24.5734 | 0.99 | 0.8489 | | CNT-E-AM | 504189.30 | 13.55 | 3.72011 | 0.41 | 0.9333 | | CNT-A-HM | 1.29 | 24.60 | 43.8880 | 0.99 | 0.9693 | | CNT-E-HM | 5.59 | 82.13 | 68.0682 | 0.75 | 0.9979 |
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